export default {
	namespaced: true,

	state: () => ({
		// 购物车的数组，用来存储购物车中每个商品的信息对象
		// 每个商品的信息对象，都包含如下 6 个属性：
		// { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state }
		cart: JSON.parse(uni.getStorageSync('cart')||'[]')
	}),
	
	mutations:{
		addToCart(state,goods){
			const findResult = state.cart.find(x=>x.goods_id===goods.goods_id)
			
			if(!findResult){
				state.cart.push(goods)
			}else{
				findResult.goods_count++
			}
			this.commit('m_cart/saveToStorage')
		},
		saveToStorage(state){
			uni.setStorageSync('cart',JSON.stringify(state.cart))
		},
		// 更新购物车中商品的勾选状态
		updateGoodsState(state,goods){
			const findResult = state.cart.find(x=>x.goods_id===goods.goods_id)
			if(findResult){
				findResult.goods_state=goods.goods_state
				
				this.commit('m_cart/saveToStorage')
			}
		},
		// 更新商品的数量
		updateGoodsCount(state,goods){
			const findResult = state.cart.find(x=>x.goods_id===goods.goods_id)
			if(findResult){
				findResult.goods_count=goods.goods_count
				
				this.commit('m_cart/saveToStorage')
			}
		},
		// 根据id删除相应的商品
		removeGoodsById(state,goods_id){
			state.cart=state.cart.filter(x=>x.goods_id!==goods_id)
			
			this.commit('m_cart/saveToStorage')
		},
		// 更新购物车中所有商品的勾选状态
		updateAllGoodsState(state,newState){
			state.cart.forEach(x=>x.goods_state=newState)
			
			this.commit('m_cart/saveToStorage')
		}
	},
	
	getters:{
		// 购物车中所有商品的总数量
		total(state){
			// let c=0
			// state.cart.forEach(x=>c+=x.goods_count)
			// return c
			return state.cart.reduce((total,item)=>total+=item.goods_count,0)
		},
		// 购物车中已勾选商品的总数量
		checkedCount(state){
		 	return  state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_count,0)
		},
		// 已勾选商品的总价格
		checkedGoodsAmount(state){
			return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_count*item.goods_price,0).toFixed(2)
		}
	}
}
